这类问题也在美国被提出过，但能源公司们由于不受多项环境法制约，致使他们已经可以忽略这一问题了。
Such issues have been raised in America, too, but energy firms there have been able to ignore them because they are exempt from many environmental rules.
由于开采成本和环境制约，中国所需的铁矿石目前80%以上需要进口，主要进口自澳大利亚和巴西。
Due to mining costs and environmental constraints, China needs to import more than 80% of the iron ore currently, mainly from Australia and Brazil.
在图书外场销售中由于受环境的制约，无法使用店内售书系统。
In activity of out-field selling book, indoor selling book can not be used because of environmental constraints.
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